Volume 116, Issue 2, August 2004
Index of content:
- SPEECH PRODUCTION 
116(2004); http://dx.doi.org/10.1121/1.1763952View Description Hide Description
Recent research has found that while speaking, subjects react to perturbations in pitch of voice auditory feedback by changing their voice fundamental frequency to compensate for the perceived pitch-shift. The long response latencies (150–200 ms) suggest they may be too slow to assist in on-line control of the local pitch contour patterns associated with lexical tones on a syllable-to-syllable basis. In the present study, we introduced pitch-shifted auditory feedback to native speakers of Mandarin Chinese while they produced disyllabic sequences /ma ma/ with different tonal combinations at a natural speaking rate. Voice response latencies (100–150 ms) to the pitch perturbations were shorter than syllable durations reported elsewhere. Response magnitudes increased from 50 cents during static tone to 85 cents during dynamic tone productions. Response latencies and peak times decreased in phrases involving a dynamic change in The larger response magnitudes and shorter latency and peak times in tasks requiring accurate, dynamic control of indicate this automatic system for regulation of voice may be task-dependent. These findings suggest that auditory feedback may be used to help regulate voice during production of bi-tonal Mandarin phrases.
Sex differences in voice onset time: A developmental study of phonetic context effects in British English116(2004); http://dx.doi.org/10.1121/1.1768256View Description Hide Description
Voice onset time (VOT) data for the plosives /p b t d k g/ in two vowel contexts (/i ɑ/) for 5 groups of 46 boys and girls aged 5; 8 (5 years, 8 months) to 13;2 years were investigated to examine patterns of sex differences. Results indicated that there was some evidence of females displaying longer VOT values than the males. In addition, these were found to be most marked for the data of the 13;2-year olds. Furthermore, the sex differences in the VOT values displayed phonetic context effects. For example, the greatest sex differences were observed for the voiceless plosives, and within the context of the vowel /i/.